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Many of the movies that have hit the big screen over the last few years share a common subject as part of their storyline. These films question reality—or the real world, as we know it—pointing out that artificially created dream worlds or worlds produced by simulations can actually be quite realistic.

These films also deal with suggestions, thus far represented only as food for thought at scientific gatherings, of how these questions could affect our lives.

What is real? How do you define "real"? If you're talking about your senses—what you feel, taste, smell, or see—then all you're talking about are electrical signals interpreted by your brain.

Doubtless one of the foremost reasons why these films, based on scientific explanations, captivate the attention of millions is the fact that people now question the reliability of the external world's assumptions and preconditions.